I get a lot of unwanted traffic from Chinese IP addresses. I'm using an old Mac with OS X 10.7.5 (my Mac is ancient, so I cannot update further), so I imagine it's more vulnerable than a newer Mac would be.
This page gave an excellent tutorial about how to use
pfctl to detect sshd "attackers" who violate certain rules and add them to a blacklist. In my naive understanding, this applies only to
How can I generalize that tutorial to block other kinds of traffic as well? In particular, I have unwanted traffic involving
screensharingd, though I'd love to block any traffic that has too many simultaneous connections or too many attempts within a certain amount of time.